Ig10 P atm

FlG. 4.15. Band absorptance (cm-1) as a function of the effective broadening pressure (atmospheres) for the O3 9.6 ¡m bands, depicting the pressure-independent regions, for different ozone amounts (g cm-2), at T=300 K.

root limit is attained for intermediate absorber amounts for the low-pressure case. The criterion for strong lines is satisfied for the CO2 15 ¡m band. For the high-pressure case only the linear and logarithmic limits are attained.

4.5.3 Temperature dependence of absorptance

The temperature dependence of the band absorptance arises from the temperature dependence of; the band strength, k, the bandwidth parameter, Ao, and the rotational line half-width, b.

4.5.3.1 Te mperature dependence of band strength The temperature dependence of the band strength can be understood by considering first the temperature dependence of the line strength of a diatomic molecule. For a single absorption line, m, the line strength, eqn (4.31), can be written in terms of the Einstein coefficient Blu and wave number as

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